SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc8e543f4324ff9b2126b8aad6380eff848117cd950cc940456eec20399626c' 
  AND token = 'EZggUXUgBQlR6MvCzF56iuOuVMU3HTrI8ALVWo/Ej/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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