SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a118efbe346c8a477f30539de27e6b809ee98ffb7f576d7883ffe6a6086714' 
  AND token = 'ukqWNmAKvBXQFFJYpQmVWmxxzWqM5VOcJ9uWlJISbtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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