Support for Lock Mates or a suppress Smart Fasteners feature is not available in SimMechanics Link 3.2 (R2010a).
As a possible workaround, you may try the following;
1)Restructure the SolidWorks model such that the smart fasteners are inside of a rigid subassembly in SolidWorks. When this is exported, it will be represented as a single rigid massive body in SimMechanics.
2)You can export the bodies of the fasteners to SimMechanics as normal creating a complex representation of the joints and constraints and then remove the constraints and joints. Replace the joints with weld blocks. You may need to create a Coordinate System on one of the body blocks with the same coordinates as the Coordinate System that it is connected to on the other body block. This will preserve the mass of the bodies but remove the complicated constraints
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