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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4680e853db42730d6bf543c199626129a87a0919225d131026ce0428e04b8c14' 
  AND token = '9wKWYm3JarNrGeJLMJv2J6Rr8uBMCtvwWB9EofipsrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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