SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6433be2eebd25aa1d30e32674f0f726a914bfe0b049b81b9a9ced15088ca6d9c' 
  AND token = 'JLeFN5LyV91tSzZI5ootMt8Kf6qcYEtZKBwTfPPMkk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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