SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d0372808c9a98dc2f147a9c93f44386d7180ffe9fd4848e02ccdc904c1005c' 
  AND token = 'eJzSB7h78etjdxRj5MX7xNqObgaD/1qgQ3qNlpck9S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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