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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e33e32f3fc49cf2358a3b97b8b18b2eb72016b84b7af7f88245dbcbedf549c' 
  AND token = 'rHQUQ3daAnvsgTHxKW+J9OQ3nUnarjxLeb87ESzLk7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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