SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b7e75a94940294c4f4f9c116669b1d3dc5ba55acffc360c1b3aa2c56f5cb3f' 
  AND token = 'Uvog7VKFmHupLYt1e6a8CHoGK16JKE4jzCK5gLQ8+Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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