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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20800adf6aafabe5d157910f06614fd37a82a8dfd8ecb24b77d0bac56d6203ac' 
  AND token = 'GfgeQzGCHsMBy0GNyS6Gf+FKFQXaQhEJLcJzjLCYJTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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