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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08ea85f1e10dd4f541cdd7311ad2058f5dfbe9f7e320b755643504cdc7e4976' 
  AND token = 'xa/OAUDOLq5kojFFWRcY1dm6mvEmc81dUWO2b8g20Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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