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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371d92dab6c8afed0c16e70348afe0ee2d8d7f015cfd207f8635bf3e464c0e86' 
  AND token = '/rzZhr9XWcIbXcqg2Mu452jvQbHZIhsHUjkXsAr0PVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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