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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925c36cbfc370349957e048e354cbeea6863f12ac894e9f72f88201375a6a748' 
  AND token = 'OKjT9vG6gT/kOduSJ6L85TUQuYmpmjLUk/y5ce84Wsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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