SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bca97dac29137c7990d75a2f62739cbcd8db09041bdc1d5a4b43a3b25aa7ff' 
  AND token = 'aIkZVBBvAxKvS3sQyh/nw4WGVzX5o2KN1BavIXaXw8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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