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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a9beff2bb2f1ec8379f02ef02f6454e7d7361303638f10af65a3f9465c28ee' 
  AND token = 'yx6C3Ay5lmqX8A1grY1hr1fHqUnQPLY1/0y2iIYK9c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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