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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e480c969b95f45037e808669cafece71afb3edd7b594506be7c78203ab0f02' 
  AND token = 'fzti2mJm5GF3OtU3XeHmxAJt1oNiM/1Rtz/9bjGoXwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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