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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742bad1f48e0b7064b53d8888c9a80bd2af0895e06cd128c315a3e3e54cc56f5' 
  AND token = 'XpESmUF4UhtxvqchRzCeErmVGEmvSkMeHxUYkroaXaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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