SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86ca58d94c7112d6c2c0f014fc066b561e73c02baeae3ac78f5b8a67f61995d' 
  AND token = 'hfrY/QOWEPuyZcTpMctthl+Q+V8WDbbB3BvLjvqjI/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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