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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7ec3749e681ecfeafee8ab1a2ea3407b7c9b6fdbc7e03a1f4ff202e1570662' 
  AND token = '3mPVxZbf02qDZPpgY0miV9vnJGIWMEQA2pXOSXaezJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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