SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd453a8576b80b56980c23ee66719aa7c180ca0819873adb6dc19f9ef2398b9e' 
  AND token = 'yn0MUvZOyvlWunI+GK44QHooRS70KmVDwzJ/SjuA38Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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