SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8df492ccbef4fca82d2f1163cfd0ff576143eb87e7b8c343e956db144d543b' 
  AND token = 'gqSusNuKJslEfBHn3aj9zoZIk/Z2zFhOeOK2gjFBcNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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