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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ada38b945ee2bed47e1f06292c35b5d6a765cd1dba9442820699a01a5002fc7' 
  AND token = 'WddlRzM4htE/wMtiUcZgHKWz0OkLwlgeXwznNjQ+qr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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