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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04dde61938fe2391dd3d39fd7385ab0a0d8cdb670685c1e79a3d03fc03da6f6' 
  AND token = '6mmlheRO9apy3ZOIGQPJmbRwiiJuSRmGPtHKY2/zZAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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