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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f30d46a4cf3bd1ec0307f323c26c919d2af8ff9c68c7ffece865f14ed3eea3' 
  AND token = 'ghMeoSySxzgh5usVZ5TQlba0UNrz6ewEUvAigMRnFI0=' 
  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