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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fddcbb089af19cf49c82cce3b02597a289774c609a00f257b8fecd5593c2fd93' 
  AND token = '/xt2jtld7NW3dRUACTiNjXbHBfu0G0cLeGjk8rdEb18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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