SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499a2ff32ac5aad8873d737f8620277af90347fbf0b1dcb3992310e075b8cb31' 
  AND token = 'je/uiwchzJJBn2FqAvh+zC+k01dYmSW9yRmldOm8hL8=' 
  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