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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c330f96a9c4e8f4f089cea811d47dd3878244f5d745ca56347a59c5b4a4bea6' 
  AND token = '7fBCATwknLKyW/u9oMjPGSif0FeSWvhNbuKRvFhzScM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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