SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407419d595659baa52c560ec669a06d8ff25a1369d0db2e81b974f52e90d6e2d' 
  AND token = '95Dmv/KGVOoyImvZBk5BmjzANPrFNxLm6/Uw5wHu6+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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