SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b4edf424fee58d5dda92f2429eca6c9683174a337281bf66254b9a747859d0' 
  AND token = 'JhKzuNq/3bbaAn/m9ueMALvSVD8R2XpRM3noKsMh+Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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