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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a0f546bd958f347bb7f5ac8c708c8f2c8e74e70c04eb00c205f8e286db3a64' 
  AND token = 'p2ubhoWWWYZE8zd/56btwGU1FGR6OlCDoQAJbeUQKlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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