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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b233639637591f698e105cf4dff2f57fcc40589825444e797e87634b82077a3' 
  AND token = 'Kn6z5ollEs7VnwbmPcp0O/bLYQbStCYbOy7PHg4Bd+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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