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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973f0f1ae5adb283e2eea967f55ba47ebd6e96c8f62895d46d88191060f8b17f' 
  AND token = 'AIH8jaAXCtV6p6wxiVim8kxafDMkYuB0syP5jDbNQ5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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