SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e6d6d1048077c6c2713358823c8c36d9d5bbac8efd41610bf7dc2e10598665' 
  AND token = '+0C9VIkSgqDyuVvOwiSf8UaTyd+Tjwp9RcPHFBJ/gns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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