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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9249bb4b1686e072c50225a9f7ba4711ebebfbcdac3701f23128aa409f1782d' 
  AND token = '5aTP3oKwB9TnSkOceKlZtalTbChSoFuywPbwOlusbl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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