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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5877c60d77f4d8bb0464219d9689caaebd3859c8d2578c8416b28df70a09a3' 
  AND token = '63hyn/NVIyBTstmbUsM/5Yt/nItQT1us5rNxM1JstnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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