Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '250bf08abad99c9ce9548793783869b0e453f92b6624168bca56644feb24efac' 
  AND token = 'wsTHTf4nN5I+mahIWCh0B8+0vgBoLAP1fnl1dhFXXmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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