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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffa6ad2f382d8bad91e33701788bc7043e63c53bb28749a1a6aa0d160a0116d' 
  AND token = 'y45QC1tYptun2i1uiNT1UP40Ph7Jr8wZ7n8su3zHuLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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