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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17be46e673f73a61b2db2f8140d1225951a6242fb32fed02f2bc71ed6f353dde' 
  AND token = '7O2mQiGRRkOCNRTgu6Azin5RZWf7Yjbg1JRsWFoAEzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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