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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '654cbf2fc2e731468a15f2d73fba70a2767db37d6da7dd50580d4d4fa24f6710' 
  AND token = '5pa5sKicXSGv828FsimG249l6y6BTrywdZp7CCLm7jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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