Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3becdcc9c50b16adcbcbfcb1e9c1ab5de8acb4bd78f46a92c2e0d237f17dba1c' 
  AND token = 'cXW87ry0PChetBjRY+dYF2AtlV8yYBCwewJ5uFRHLtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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