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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5708e10f592c4a57b43c079fad2eba0fc289ba60ac802614c5b6734cdb09c678' 
  AND token = 'Ui+aOA0xqnr9K52X8iiZ37CYMYWNZKOXSdYYY2IUe8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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