Preheat oven to 350 degrees F. In a bowl, whisk together the graham cracker crumbs, brown sugar, cinnamon and salt. Drizzle in the melted butter and toss together with a fork until all of the crumbs are evenly moistened. Press into a 9-inch pie plate. Bake for 8 minutes. Place on a wire rack and cool completely. Reduce oven temperature to 325 degrees F.