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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8094a7a43801eb6b63481a82cef0cae9944c51a47b60eecaaadf12673a85f80c' 
  AND token = 'STVZsvTFOYn9z6OmLFOLvjwBru+97/hyyNJNif2eb98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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