SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdf8327f5dab04a454be441bf3d6888168ede8fbade52633a45641bfd4d29da' 
  AND token = 'BZkNXGGgGLYNu7AJ1rqTBC7G1TO+SPlnfTHDLuDYUZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

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