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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f645d4a9752f3f7cb7ceb27e09cc0aae7c5206ae12ec9ed7149f6e6c8d602c' 
  AND token = 'Rvxuc/0GsVavmKgWvGr5s2vHmAF0OlPAY6e/NS9xrmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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