SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da30af550d680bbad11ec9ade830d8ad89ceb7e2d3648394ffe568f5b72b6ae' 
  AND token = 'VEyc8VqtjwlV0tXrzSKkDd82e45zhghBvGPYYDBAWK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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