SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '442a3c1ed82b39535067bd3c3d641983ffe3940584825f6c39055dad4ef92ac7' 
  AND token = 'jSvtguf6bIHPkEU9DlI9dRzqJMpx0gajC9G4KtAZpwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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