SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c53876178ab48b9b446bc7c66e483c0f0572a4072527fb74debd45000488b7b' 
  AND token = 'DKyFWCIvyCBagj169H0UXPPpww3zhxBK5ZBMf9/ssfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}