SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216258377ffc8326fa47de435d3ac48116fb9d11880426ec66832ea99148c801' 
  AND token = '+353+mdD06GLun3IVV/qShP/RAXkgwzA2YrOx4FgsJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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