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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24abaadfd1863d86e7702886c1ff70dc58003b9be196f72eb1e4381c5da715c0' 
  AND token = '/irY/lXotLMcy/+Zn6o/S/Va5yO7KPzJG9ZjEkA7rkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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