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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338e317eb1c6ff9c3f04d074d55d5e5f905d56a452a14eb019ca0b9754a2bc26' 
  AND token = 'rx5h1bAkQibffS3AU4QjaxSuk7oZq371z6H+NGkgtLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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