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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99563598748b5ee4e8e2a2de956d7a8e5baab44ce42575410967871388d11b76' 
  AND token = '/U9o1zWUXLW7GjqsiDB4t4rlEY65bm9W1ZU9QPQ7m5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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