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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5222a62de03ab85e5ef94b5e717080bb237583130ea9266e496789da67877c' 
  AND token = 'ty4E6zr3pcGp5sm0H+Tavl8TY2+EsVNCdF+4DWnlBdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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