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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b07d91083275931faa94ae9af97fd1ffd3c0734e2c041ee959f1d9206a1cb6' 
  AND token = 'BcTUe2ktubwmy9RIv9XFigYZ70EHIIx3oIS1XXYHZz0=' 
  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