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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b0a6fc1df2c7ecffefac9e9ec46b95972db1ed4eabd95d189947823ea8f9c4' 
  AND token = 'CpBCv9B4HKM+GXiOmnFrEOx6OU2NSwxaRSGGOJNY7MM=' 
  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