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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3478c3c9da9495acd54f1878e9eabcb7d7714347a4e3803ba29a3edba86a87' 
  AND token = 'vE9sbpGYiEUnfQ1npM7bF4DyQmuShQrnZYMvBYO9CFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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