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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3edde28ab6e6a1fd30c83e3076d2fd05cb8c0e083c34f88fa56004936e2648' 
  AND token = 'f/tJrrr9fW6HpLERzBILhKCbzbEQCLK9I5iB+FNfpQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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