SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ed1ee90324e1e1d1f74ba50ae4c1769321d394600ad6c7c812b38daeea06dd' 
  AND token = '1sXZB0Kc2gFjqXYs1X+xfOCtwQE8RkawuNd+xTzb/j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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