SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd26eb45b72de0f183294b1983521094b7c681e1f7838d975d33955b494c95e6' 
  AND token = '/CLwSPXmQBClV0IvaVN11CcDbhcBNXbLtJ5+6HKJpBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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