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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e94081e9696d489d9905f3582b575df3eea782d340aa4f593b19cd5ba4fa58f' 
  AND token = 'Vv9o9xTRORLGg6Bfn3b9pHY+9xaK+e5Kgiib+H2XcFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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