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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc86d11c2f6893323e1b6e83da9bc111221e9649ebf7190f9c58363e00eb336' 
  AND token = 'wcArWYNgEyTcZ7Yau7ECUC7r8dIpqQfWFpNibGU1R5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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