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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09ef00a3b1441f3cb61923edc3d6e2177018121e7d47cac74b97bce8652f5f8' 
  AND token = 'bXz5PlTcP7eC3R6J1eyJ/NtgO5kYc8+R1U/9XNjSu6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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