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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b008cc3c53da62c6440ebaa6f47b8b1df0f0a72b80e117257f2c73c4569f075' 
  AND token = 'VRtYdO2406T/Ug2xqqO2WDU/kEozQr8jMMA2e9jpnM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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