Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6d167fc27a8df9dfe48567877ecb9fc8f20ad344ac99814682e50f78f274e4' 
  AND token = 'VL1pMtg+uwOeu6VPx+UyVgz9uSwUBKgWcnKSfo+Wzhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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