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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d80fb4864933ff1ee29a8243a91d97a56c61969a01ae0e7c2f2649aa6bfff7' 
  AND token = '7y3NBzFG78GYABbysVQFpkYeYxxs9IQriH39yiz1MqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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