SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3826a631788aa12979673deb331b9617b128d6b143394a0acde8cc57fb7ef9df' 
  AND token = 'Nq6FQhxhYvUKHgouW/1lRML11nOgPICm/HoHBpcVB3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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