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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a27e0587ff5eb63062382352ec3b02aac2818a06431de704190fb2bdfa4a6e' 
  AND token = 'YLuENzJ6KfrY8n76cm3cgE8XGA6iooQ1hI9Jhy3bswo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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