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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd001f447d7a4744ad4df5b1f0e8b66363c0e3ab6f2bb37978f133efecd7543f' 
  AND token = 'gxsdxJlicT9GvvU7t5nSZ9YkVMaj6IvGoSvFhw2IfuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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