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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2936987247206b2a949ff11befa90cb3512cd52bbfb636d8e55fa12a8d79fc63' 
  AND token = '2rXdkqSOj9fx/Adn/sdl5f95ZUEH+ZAc3K9wba+AEaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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