Preheat oven to 375 degrees. In a bowl, whisk together baking mix, granulated sugar, raisins, and zest. In another bowl, whisk together cream and egg; stir into baking-mix mixture until a dough forms. Pat into a 6-inch round on a parchment-lined baking sheet. Brush with cream; sprinkle with sanding sugar. Cut into 8 wedges, and pull them 2 inches apart.
Bake scones until golden brown, about 20 minutes. Let cool completely on pan on a wire rack.