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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbeb54be864d48c3983d2ff1d5cee8ad73634101bbbb18e004de52e54fb6267' 
  AND token = 'IlB5A8rlgY/TwDihyGFgYQ1JUPnAipqTkBurED6gvFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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