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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd934ccfc14d5dfc695af7b968f479d69a9ce98fc58009926aed51f87a39b93dd' 
  AND token = '2KuwBli4k5sgJKCzHgiDzI6hINw1zUcNWyAkFALvVv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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