SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117702a584b477092c8f2da1a34cbdf1affbdabb360a3deb7902ad3a48488df1' 
  AND token = 'NUWrW6O8HpVX2TB3l++nNgBYWoW89jKce4S46bw1PPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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