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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab8ec4ea16e2eaa9b153e9461279db43131543c979e01978415788710a67f24' 
  AND token = '+ajkSWCZ8blVsAdsO1DBG/QfyGAh2AW7qiUvXy/rtJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

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