SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba90398319e1fb4201335bd544cccf0fa9eddea76b5d73866d32feed5d6eff7' 
  AND token = 'iKmgpD4gSZ1LqskcHey6wmps/Ll6qxODbXf5xDNnSCw=' 
  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