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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a5286e5f0941712447c390a08f771d381eb73363dedc5c16fb651e3661b586' 
  AND token = 'S/YSiAzxA2v7Dt8KuXJ+S1iAYroC/HDfdATNYky24+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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