Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98d6a5b9ff1288fff3621f08801ba5244bdb498712545a247ca5859556822f9' 
  AND token = 'cTTsyPksO29G8QIigJtCKCcTWSqRQxmnJIs+sForidY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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