SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0463f31ff0bfb36462fd9bc9d72c29b302c9bbcd50964abe4bd7420770ea3844' 
  AND token = 'iW/VrRh3zwu4rtGqJjAs6A08vj6ZY9HkHIS/PcDp6TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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