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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fadb2b2d15acbf5bf551f3413a690077adff76c2e34755e078b8f5a59ea5dbc' 
  AND token = 'FpoLkrgRtuEeOhKlC+orBHKm4ScZT6ogL+teSn6DEjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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