SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9571d44d239bc82d64fc4a1153cb2cd86552ecd886565fe73625d93be79bc0df' 
  AND token = 'TJW0YAUjubDRwuWR2+WvPU6OXsGBtjTVEEqV+iYpf6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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