SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb1de443c84c770efe66f79b8ebd5aafb82223f3898a9a35c519857c41e93ea' 
  AND token = 'gIC0iKXsw1jIig9rzrhPXLvVvzLAHFJwnV8tHCitOrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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