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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f97c0d0ee706577b29d10d6122d4bff74cf0d6e7fe8cf82a6f254029544e9d' 
  AND token = 'hndRCXua5P1Dg48ZVbKULVTZSuOuzVDlOiLYWrVtdRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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