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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bda3bfb234d04540cd76bc1fd6cdf2fabc66aa171ba1c98d3ce658ee20f6b36' 
  AND token = 'NAjp0KU16Ie2asgy89AiN3iv9bwKpra6HwUXT2CGvlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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