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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048a4932c4bccaac7b017237542bf427168a4e87c6d155451ac3d8ad86517a9d' 
  AND token = '3hCMEMazufbgASZ+XGc7HAo/3r2DzqLOpr+Ph53Nc6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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