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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217960bd90f72aef238014045564c70c0dd1c6cd723234c2e3f3cae4abc9bbd4' 
  AND token = '0XVqhbzhIBkmWcSqMoJnj25bXgRYP8973aVXT453nAA=' 
  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