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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4923cba5c25293b36e522952ecd2c992d2575fe52a1576d492d8f7edf8a5ef03' 
  AND token = 'u5acX6x4Ok6V03MRea4qR5W/SIWia4OqoeAJdhMPJ+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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