SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35985bd6ff931decf50539c5e60b42094a39adc167c554d40a782556029b7175' 
  AND token = 'WuyGv8hIgocSTYHc8bqZ6uhsYjCegE4QJp7AHJPU/PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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