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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc8f069a1b610c85c66389cbae16199c4725536204a17e1674e72d05a9c7fb8' 
  AND token = '8dRt6nj7pNVh97gF30TYDE+TgdSa6fGz89z/3bumIos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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