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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb985fe08ab078b245a53d00f9a31e96d1540f6ce90f106c8b78fd68ce8f5fb8' 
  AND token = 'kuM93V4qpzitvMGJLG4A4T2hGAaYfBagiPDdoqQrLdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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