Calling this flop? K2s (button)

[z28dreams]

home game, 8-handed, .25/50 blinds, $20 buyin (ya)

Hero is dealt: K[img]/images/graemlins/spade.gif[/img]2[img]/images/graemlins/spade.gif[/img] on the button

Preflop:
2 limpers
Hero limps on button

Flop: ($2) K[img]/images/graemlins/heart.gif[/img]3[img]/images/graemlins/spade.gif[/img]7[img]/images/graemlins/diamond.gif[/img]
Villain (MP) bets $1.50
fold,fold
Hero ???

Note: MP villain is a bad LAG. Also, behind me, i'm about 90% sure that the big blind is going to at least call here (though I can't rule out a raise). He is passive though, so a call is much more likely.

Do you ever call here, since you hit top pair and have a good chance of catching an extra spade to help on the turn? Or just fold and get out of the way with more to act behind you...