SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a10f66c23d8fc465d2752b724246107bf86e28b57c39249eb8c037319f0d917' 
  AND token = 'Nm54tASYnn7nkopU6CvBKOBUv6wI/FsVD8/OkJKoE3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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