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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add4de4e6c7d2e4bbf3c291dc2181d6a45cc16fc724612ee0ce3c869e8fe05ad' 
  AND token = '/p3c73Hy88hVIRC98mfJzMIzJYYrzyILPhz+yK+RcEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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