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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cf444fee2f0517273c9c92d54278ef3d8551e4ff43c6a9ea7eb772b1b1bc1f' 
  AND token = 'wR/bHdVy8jARmLJSEoJiOx5qTxesnty6GGtUlXT+GIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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