Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fee241dbd807a53dbe406e8ac4aa8aab7875ab1e872f8ba4ea49e2a81b9ea1' 
  AND token = 'j8NY00lnAS+is07kyTHkEVUaue0QbwJaMX9weQd0HlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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