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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec616b57e38d739bdd29b77a94830409603ea10784043287d21a255d73552684' 
  AND token = 'IbWEFuG0c2HbdOp8g0eubpy/AY/u+wI5gWilMXd+7EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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