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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6867166b402fa3e03711e3f959c2274f6d1a43ceb6d0ec7ae1fd8f4ea2dcc88c' 
  AND token = '2VekusRfSUayQCfqVZk8anJgIjBjE43a1h2+xYZrHwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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