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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a442775c8c6674a6230f715289de94df8d2e40ec20de27a53022b77f2a5fe429' 
  AND token = '1uxQ3l/fdh/dZkHtTLxX9UMZ9g4wFNzoDL+0Ea016uE=' 
  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