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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd8e51aca048b7928eefa9b26de4f531322038b194695ed60cc3a106e46fb81' 
  AND token = 'ynJIql5Lyrz03NyBgaoo0BtIYuccc8B7R4ETaPo5mng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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