The two sides had sparred for the whole match until the defender advanced to bring Stones manager Jay Saunders a gleeful moment in his 300th match in charge.
In a fascinating tussle, Ben Greenhalgh nearly scored an outrageous second-minute opener for the visitors when he bent in a cross that hit the upright.
And Tom Murphy fired a shot over as the away side threatened.
But Kenny Davis could have made it a very different day for the Wood when he nodded an effort against the crossbar.
Report supplied by the Press Association.
Match ends, Boreham Wood 0, Maidstone United 1.
Second Half ends, Boreham Wood 0, Maidstone United 1.
Goal!  Boreham Wood 0, Maidstone United 1. Kevin Lokko (Maidstone United).
Dumebi Dumaka (Maidstone United) is shown the yellow card.
Substitution, Boreham Wood. Morgan Ferrier replaces Angelo Balanta.
Substitution, Maidstone United. Dan Sweeney replaces Jack Evans.
Substitution, Maidstone United. Dumebi Dumaka replaces Ben Greenhalgh.
Substitution, Maidstone United. Bobby-Joe Taylor replaces Anthony Acheampong.
Ben Greenhalgh (Maidstone United) is shown the yellow card.
Second Half begins Boreham Wood 0, Maidstone United 0.
First Half ends, Boreham Wood 0, Maidstone United 0.
Substitution, Boreham Wood. Conor Clifford replaces Jordan Chiedozie.
First Half begins.
Lineups are announced and players are warming up.
Kevin Lokko consigned Boreham Wood to a painful home defeat with a stoppage-time winner for Maidstone at Meadow Park.