SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff2c03116f8ef64d7ee3c96039509501895745779a4a74463fc277517afe178' 
  AND token = 'yRBMkURRLlhMMsS6qIIuvQnw3ys7txZVy64qwEd+j3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables