SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674850b081c38b4aa34a0f0f87ef40125984a7ffc378378d9be0d41bc65ccc24' 
  AND token = '0C5DQzGA+gVAwpAuqdT0uludhXR8BO2iIvKr7PHISCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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