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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f952b5ca74e786a1f026303ee7090ea0472c904f268da5f77b502d0f4680fd' 
  AND token = 'c15BlfwhG/XOBxu2qO/A0cPlqKw8/8WcM5/XvYNpZyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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