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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39649c2db94a78ece4358eb0f982710394485d73bb34412b091d6b5abf2d739b' 
  AND token = '/UxvMwC6QdZ7UYqNcgWAca9O4ffanaYvoCEGWQFNIWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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