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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff36e970e78561bd6cb73505d6daaa09be5b954d0952193026b842b97d78328' 
  AND token = '9NXraqHx9LKjP9Y2Mwtn2aG059e42/6q71l76tP7sfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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