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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a507b9f7cc11b8d620621253e0a89d4efed6f82342877478c44b1d52bcf982' 
  AND token = 'pWuMezbWO1G5msRo5xaxwqaKkUcckX3uy1a3DCaXwQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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