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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17461392bb4e0aa950fe743a20acb7e34887dc1516569acbf663a2597b72a210' 
  AND token = 'vOfR8NCUiKFviezcMiq9WDcJXsEybEA0PM5Ns3wNDjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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