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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813c39856a10532e7a306336fe78555e8d02866c736321b82298726754b5cdd2' 
  AND token = 'OcME695LlXEUMk2+SuQTgh/GSX/q7uOeXOpHUA/HMt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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