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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d596222219b87058af42e39d4b759807bb7f6e5c112e0765bdf28336339754' 
  AND token = 'ss0feoxhYn6UsszoT52EpGcMYvi5V70RcXqQix0XaEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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