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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d540adb68cebe9e01239d476e4cd005f6801eccd6348fc67cca9acadc82ebe' 
  AND token = 'WRg9GYVngjilpddnvi2RGU/CMleDD9TWfHeeY6y1fB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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