Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866b8dd26849fabedf4984055f4f31f930e27a984effc76b52e3f8ec9f50673e' 
  AND token = '7hdanZRwwPP4TLnNNedSELvVs861c0WvVMeXvo2hASg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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