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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dda34e30f67ea62447e28f7e21b295bf64cf17831eaf2acea30640b71421539' 
  AND token = 'qEBW8Mw0qROaQrvEEQbnunyGLzRnjEOG3mTW8QLT4BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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