SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4addb357d98e6012c2a763599e3ff201f429c6e4b7097072027febe69e6d2649' 
  AND token = 'GiSuUzctJhlcAgx9A4HqT5ohcGJnWAiE8QkiFUtPy3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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