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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841c8fd174d49143d97da2fce6c1cb89de3f9658b3241217293d6a72e70d9483' 
  AND token = '8+ybRDUB12VtB9utDOeTGPD8Q4jf3hMmaO2zgh65hb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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