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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb768e1377208e3416b043d93d3330d776d3501d8ca094de9c6f836fa845c26f' 
  AND token = 'C6CwfHOw7FxEl8MDp1FYBz2R2v9nMH0UqGM6cadaT+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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