Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe17be2e4dae09f393df93e6df2709e41bb92db5cac3da556da318d8a52ee7f' 
  AND token = '3MgccAxLAQefSFtdQpOLmtZhs/fD2QTAqAzeFuvHpfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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