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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1400736cf50b543fdf8969234cbaa3171c9b8c810dedade3d991ab5df38aba9b' 
  AND token = 'YvQhlei3XiJGnNY+yKaGmItF6oX8ePZbnJqTxGHQXO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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