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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae5a7508eebf3d3884beab692be56f84bb2453f71f249878253e7a3f4662b0a' 
  AND token = '7A3tl3Rxla5oYTUfidTPo9TLgfzg5quJVti9tOy5zzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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