SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00234623b94e5ba441edb8fc75ff953d6d580530120cbc5a740102ee931f8c81' 
  AND token = 's2Vqm3B/54uQYWzRKJMKxFPHuJBhGnN6YtivznRnq24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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