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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76456d8202f5bd833d84a3f629231ff29259bba064343f6b09a109d36e6de684' 
  AND token = 'pY6IfPzS1m16XN+L7k99C/xVNIyJSvhgbvdO4q9tFsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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