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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648ba215070aaed9f2db57061c92a5075b7bb57ec6824e88a4af9d5fd23ef950' 
  AND token = '5fZFjsFQonc+ckx+klQ4jpGU4P4Q61QMVcSrUqElliI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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