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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10d8760e13df74f80cc33a13db3b38d486c29f8711ba16a953aab2d0d77cf4a' 
  AND token = 'yauaqD76Wo4WLuMjxKo6qH6SkUe2nXIkdzqC8Ui88qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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