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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8bab71273fbba7c0b7cebe9aedd017e48fff4e48d7388d4b0cf55afd2a8ddb' 
  AND token = 'V7I6YFTfOb3bkQTQj+oJ7AllX0jhJzdoOo1SDYF2E8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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