Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e1467fccf4ab8c00b577a09e43d074e140d0d0d95468e31da464606ec6ac51' 
  AND token = '/DlLtY/PZ3Kurhst9YYcxj9xbfQI4naFzFcD7Uweujk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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