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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76dd1c5a8d53578b6ae763168ae2f8e52117a3684911da0bf67639f376facea' 
  AND token = 'A3crKPouEEZvrrk9Zh6Qpng+4P3UnAIrMoz62A8KiC8=' 
  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