SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daded9528e3f4317b5cf2f329444961f12faa40483341811e079e1b4a4299c92' 
  AND token = '+/I1J8N3nNj0cgzaZ+xPMYGtUIbt4uwgLhBrU4CFYfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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