SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bee06b94827117d39dcf55fb3aa104258ba7cf7c62812161848a9ffff750bf0' 
  AND token = 'btGc8jXBun+vgJpCHzwRB8JKTslcXLK33PGJqerN1vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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