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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9718d3d69426b5bf0a8de01c9195a54b6381573afcc06dd6f62bb27a4125a556' 
  AND token = 'WCrUmMMsJJ37HN8IsVO4Q44PNteE8SWfvI4mwduNNMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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