SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd63426974bfe154de221a04c7dbc81898f4f951c0ab52c44b18007d376e122' 
  AND token = '3DkHZuKq5wbemcXM/EjDI6fTsrQGY5onN6WIDhJ72vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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