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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe8427f2d70d9b819f5dc87c569a6b161805086871f6d914a860facbe4eed50' 
  AND token = 'fGsyOR9RW6ITZqLNt9MnzfdGbkH80Zy/se2eWpt8bg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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