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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6f213d407c5e263703bbea86ff9d4b5f416188bb33e4634ecf465faeeb5fec' 
  AND token = 'jIcuwr5mCdvQELW7VHTvwpHlOv4bTBuZr7iJf6Yt6W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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