SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f63dc961ab43e36d0a0a28eacebc5fb4455270427c42613062324cf76360a4d' 
  AND token = 'h6Nub9LgT5zQVXlZ7wwcgPjF/uuBlIymxkQCJGVxdKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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