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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d8e0dfa0bdb1ec20f219900f18dbd8c211af47d8c6587af5b4f1ea45f4139e' 
  AND token = 'S87WPYoiwHgWWOxrfBzB26qgmaUNqt7aRZMQrRHmSWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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