Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8cfa11b9994d9f3fc09e3dbdc848a26ddc8d6a0b50d5b7889e7a7fa8250c2f0' 
  AND token = 'zcrwSdUlmfD9QpUxo89ME7VXyc+LSY/XegTdYj7zmpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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