SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b738a7e77f6531f72acb0f8def94a4d87970b7451331efb9b097707ff0d4013' 
  AND token = 'Nri/bb2TuWRMMYzCRbdsqCSB9Zka/QcOfPiiIwd9H3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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