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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b22e8e4aaa46bb6d377c7a317c9be1b171f66dcde30a49e38aef0e310857db' 
  AND token = 'QHnSsEJYhnhra86CNo1PmuLZehF39ezkoouI+WfHn40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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