SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a7146145fd0138130ecf6d472228c5f03cca35065cdaf8d81af2d818a7769d' 
  AND token = '/Ejx7JO+FaRIjYu6rbRBPINvqw5Lx+AmQtWpGFMKnBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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