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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac1d1766a6e37f13d951567683760b06e2586a706beb62b9eb0182f7b257fee' 
  AND token = 'BmL9vqDBInsMOjYUyJQmf+LBsuCinLPvSvdzOMaK+kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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