FIG. 1 is a perspective view of a lock body showing my new design; FIG. 2 is a top plan view thereof; FIG. 3 is a front elevational view, the rear elevational view being a mirror image thereof; FIG. 4 is a right side elevational view, the left side elevational view being a mirror image thereof; and, FIG. 5 is a bottom end view thereof. The broken line environmental showing is for illustrative purposes only and forms no part of the claimed design.