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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33bd57bdbecca3fd7d7ebd05f1ce88eaaad1c467605219fc7fec6eaf8a57851f' 
  AND token = '+jRVM1wl5EHzdisWPfeYw7607ZQnhTCIncGxZTggvlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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