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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3f6d031ff634063b8deea63c51728a704411386c673a556256be63ca93169f' 
  AND token = '4ya8u2WdwJXtc6j9bkN3YDJV5RWvMNM2m5ALcwAhZq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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