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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023a97c8750429f83eeb61d9e9b1d9e1701f4fbe77a2677569c130e696f40ddc' 
  AND token = 'VSAy26Dh1WNFx9CpYjVuOC5IuP0fD4fCiAvJIxoKRJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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