Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6788bfcae06ee4d04927c721ab6a42986122a4e44970c1e3a99bca35dcf071f' 
  AND token = 'stjmT12ORIaOxNc/+fAvnJlLo5/93fEHsxlNWcbhwlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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