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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12992a87bfe1e366b283be57c90fc4c40a92e7f8650cf3c69664ecd96bb5f596' 
  AND token = 'OA3Zq+Wh2riEl4kMVIUaT6fBTdO/mZnS8PDQaZjz+7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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